formbook | 4ab57e7ea479a0f4a2d483f867dde66ba16eec6f63bc30dc5899e3f66f8eff7a

General

Target

7198508deba3bea435ec999f261de6436eb5e44d.doc
Size

10KB
MD5

8f7772863ed0144ca6654fbb4479322b
SHA1

7198508deba3bea435ec999f261de6436eb5e44d
SHA256

4ab57e7ea479a0f4a2d483f867dde66ba16eec6f63bc30dc5899e3f66f8eff7a
SHA512

de01136ce66f32fc81728b3b19710693c51f36d02580d619ea81f1b8564efb56bcef7a7a8d6fe542d9a33f8a627830ae35bc8fddffdc6b4fd2acd2a364b3b8a6

Score

10^/10

formbook m8g0 rat spyware stealer suricata trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

m8g0

C2

http://www.corbvalperu.com/m8g0/

Decoy

exclusivecan.com

junzhesuji.com

acces-credit-mutuel.com

iknitvintage.com

solonmodelun.com

debekia.com

peanutskitchen.com

kamanantzin.com

personalmodeststyle.com

qo49.com

googman.site

maisonshahnaz.com

annaalexandrovich.com

californiacashcars.com

ncafashionboutique.com

nsu0.com

cloudfirstlender.com

allforchildren.net

vn80000.com

restroon.com

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata
suricata: ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile
suricata: ET MALWARE Terse alphanumeric executable downloader high likelihood of being hostile
suricata

Formbook Payload 3 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/920-80-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/920-81-0x000000000041EB70-mapping.dmp	formbook
behavioral1/memory/1708-92-0x0000000000080000-0x00000000000AE000-memory.dmp	formbook

Blocklisted process makes network request 1 IoCs

Processes:

EQNEDT32.EXE

flow pid process

13 1312 EQNEDT32.EXE
Downloads MZ/PE file
Executes dropped EXE 2 IoCs

Processes:

vbc.exevbc.exe

pid process

1956 vbc.exe
920 vbc.exe

flow	pid	process
13	1312	EQNEDT32.EXE

pid	process
1956	vbc.exe
920	vbc.exe

Abuses OpenXML format to download file from external location 2 IoCs

Processes:

WINWORD.EXE

description	ioc	process
Key opened	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Office\Common\Offline\Files\http://cml.lol/fx9g4o	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar	WINWORD.EXE

Loads dropped DLL 4 IoCs

Processes:

EQNEDT32.EXE

pid process

1312 EQNEDT32.EXE
1312 EQNEDT32.EXE
1312 EQNEDT32.EXE
1312 EQNEDT32.EXE
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

pid	process
1312	EQNEDT32.EXE
1312	EQNEDT32.EXE
1312	EQNEDT32.EXE
1312	EQNEDT32.EXE

Suspicious use of SetThreadContext 4 IoCs

Processes:

vbc.exevbc.exeraserver.exe

description	pid	process	target process
PID 1956 set thread context of 920	1956	vbc.exe	vbc.exe
PID 920 set thread context of 1192	920	vbc.exe	Explorer.EXE
PID 920 set thread context of 1192	920	vbc.exe	Explorer.EXE
PID 1708 set thread context of 1192	1708	raserver.exe	Explorer.EXE

Drops file in Windows directory 1 IoCs

Processes:

WINWORD.EXE

description ioc process

File opened for modification C:\Windows\Debug\WIA\wiatrace.log WINWORD.EXE
Office loads VBA resources, possible macro or embedded object present
Launches Equation Editor 1 TTPs 1 IoCs
Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.
exploit

Exploitation for Client Execution
T1203

Processes:

EQNEDT32.EXE

pid process

1312 EQNEDT32.EXE

description	ioc	process
File opened for modification	C:\Windows\Debug\WIA\wiatrace.log	WINWORD.EXE

pid	process
1312	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

WINWORD.EXE

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	WINWORD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	WINWORD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	WINWORD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

WINWORD.EXE

pid process

1640 WINWORD.EXE

Suspicious behavior: EnumeratesProcesses 18 IoCs

Processes:

vbc.exeraserver.exe

pid	process
920	vbc.exe
920	vbc.exe
920	vbc.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe
1708	raserver.exe

Suspicious behavior: MapViewOfSection 6 IoCs

Processes:

vbc.exeraserver.exe

pid process

920 vbc.exe
920 vbc.exe
920 vbc.exe
920 vbc.exe
1708 raserver.exe
1708 raserver.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vbc.exeraserver.exeExplorer.EXE

description pid process

Token: SeDebugPrivilege 920 vbc.exe
Token: SeDebugPrivilege 1708 raserver.exe
Token: SeShutdownPrivilege 1192 Explorer.EXE

description	pid	process
Token: SeDebugPrivilege	920	vbc.exe
Token: SeDebugPrivilege	1708	raserver.exe
Token: SeShutdownPrivilege	1192	Explorer.EXE

Suspicious use of SetWindowsHookEx 16 IoCs

Processes:

WINWORD.EXE

pid	process
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE
1640	WINWORD.EXE

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

EQNEDT32.EXEWINWORD.EXEvbc.exeExplorer.EXEraserver.exe

description	pid	process	target process
PID 1312 wrote to memory of 1956	1312	EQNEDT32.EXE	vbc.exe
PID 1312 wrote to memory of 1956	1312	EQNEDT32.EXE	vbc.exe
PID 1312 wrote to memory of 1956	1312	EQNEDT32.EXE	vbc.exe
PID 1312 wrote to memory of 1956	1312	EQNEDT32.EXE	vbc.exe
PID 1640 wrote to memory of 1608	1640	WINWORD.EXE	splwow64.exe
PID 1640 wrote to memory of 1608	1640	WINWORD.EXE	splwow64.exe
PID 1640 wrote to memory of 1608	1640	WINWORD.EXE	splwow64.exe
PID 1640 wrote to memory of 1608	1640	WINWORD.EXE	splwow64.exe
PID 1956 wrote to memory of 920	1956	vbc.exe	vbc.exe
PID 1956 wrote to memory of 920	1956	vbc.exe	vbc.exe
PID 1956 wrote to memory of 920	1956	vbc.exe	vbc.exe
PID 1956 wrote to memory of 920	1956	vbc.exe	vbc.exe
PID 1956 wrote to memory of 920	1956	vbc.exe	vbc.exe
PID 1956 wrote to memory of 920	1956	vbc.exe	vbc.exe
PID 1956 wrote to memory of 920	1956	vbc.exe	vbc.exe
PID 1192 wrote to memory of 1708	1192	Explorer.EXE	raserver.exe
PID 1192 wrote to memory of 1708	1192	Explorer.EXE	raserver.exe
PID 1192 wrote to memory of 1708	1192	Explorer.EXE	raserver.exe
PID 1192 wrote to memory of 1708	1192	Explorer.EXE	raserver.exe
PID 1708 wrote to memory of 1948	1708	raserver.exe	cmd.exe
PID 1708 wrote to memory of 1948	1708	raserver.exe	cmd.exe
PID 1708 wrote to memory of 1948	1708	raserver.exe	cmd.exe
PID 1708 wrote to memory of 1948	1708	raserver.exe	cmd.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1192

C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\7198508deba3bea435ec999f261de6436eb5e44d.doc"
2⤵
- Abuses OpenXML format to download file from external location
- Drops file in Windows directory
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1640

C:\Windows\splwow64.exe
C:\Windows\splwow64.exe 12288
3⤵
PID:1608

C:\Windows\SysWOW64\raserver.exe
"C:\Windows\SysWOW64\raserver.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1708

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Public\vbc.exe"
3⤵
PID:1948

C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
"C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
1⤵
- Blocklisted process makes network request
- Loads dropped DLL
- Launches Equation Editor
- Suspicious use of WriteProcessMemory
PID:1312

C:\Users\Public\vbc.exe
"C:\Users\Public\vbc.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1956

C:\Users\Public\vbc.exe
"C:\Users\Public\vbc.exe"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:920

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scripting

1

T1064

Exploitation for Client Execution

1

T1203

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Public\vbc.exe
MD5
d1eee2a323fecd8a01d5f6adf16a4649

SHA1
7a2e157e233c35cee54427e9b85cc4548b1b956a

SHA256
6d76e5df40e22d995260686fc0a37eb0520eac5988fa45945c45d7d727ffdb1a

SHA512
e4d8463aedfeaa62ea03499fb63c36ea20009f91b5a47d096a65e85eb10d430b03f8c8384bc0cc18a16133d8294fc66aff7fa6fbc870c43ff312f1299f235934

Download Submit
C:\Users\Public\vbc.exe
MD5
d1eee2a323fecd8a01d5f6adf16a4649

SHA1
7a2e157e233c35cee54427e9b85cc4548b1b956a

SHA256
6d76e5df40e22d995260686fc0a37eb0520eac5988fa45945c45d7d727ffdb1a

SHA512
e4d8463aedfeaa62ea03499fb63c36ea20009f91b5a47d096a65e85eb10d430b03f8c8384bc0cc18a16133d8294fc66aff7fa6fbc870c43ff312f1299f235934

Download Submit
C:\Users\Public\vbc.exe
MD5
d1eee2a323fecd8a01d5f6adf16a4649

SHA1
7a2e157e233c35cee54427e9b85cc4548b1b956a

SHA256
6d76e5df40e22d995260686fc0a37eb0520eac5988fa45945c45d7d727ffdb1a

SHA512
e4d8463aedfeaa62ea03499fb63c36ea20009f91b5a47d096a65e85eb10d430b03f8c8384bc0cc18a16133d8294fc66aff7fa6fbc870c43ff312f1299f235934

Download Submit
\Users\Public\vbc.exe
MD5
d1eee2a323fecd8a01d5f6adf16a4649

SHA1
7a2e157e233c35cee54427e9b85cc4548b1b956a

SHA256
6d76e5df40e22d995260686fc0a37eb0520eac5988fa45945c45d7d727ffdb1a

SHA512
e4d8463aedfeaa62ea03499fb63c36ea20009f91b5a47d096a65e85eb10d430b03f8c8384bc0cc18a16133d8294fc66aff7fa6fbc870c43ff312f1299f235934

Download Submit
\Users\Public\vbc.exe
MD5
d1eee2a323fecd8a01d5f6adf16a4649

SHA1
7a2e157e233c35cee54427e9b85cc4548b1b956a

SHA256
6d76e5df40e22d995260686fc0a37eb0520eac5988fa45945c45d7d727ffdb1a

SHA512
e4d8463aedfeaa62ea03499fb63c36ea20009f91b5a47d096a65e85eb10d430b03f8c8384bc0cc18a16133d8294fc66aff7fa6fbc870c43ff312f1299f235934

Download Submit
\Users\Public\vbc.exe
MD5
d1eee2a323fecd8a01d5f6adf16a4649

SHA1
7a2e157e233c35cee54427e9b85cc4548b1b956a

SHA256
6d76e5df40e22d995260686fc0a37eb0520eac5988fa45945c45d7d727ffdb1a

SHA512
e4d8463aedfeaa62ea03499fb63c36ea20009f91b5a47d096a65e85eb10d430b03f8c8384bc0cc18a16133d8294fc66aff7fa6fbc870c43ff312f1299f235934

Download Submit
\Users\Public\vbc.exe
MD5
d1eee2a323fecd8a01d5f6adf16a4649

SHA1
7a2e157e233c35cee54427e9b85cc4548b1b956a

SHA256
6d76e5df40e22d995260686fc0a37eb0520eac5988fa45945c45d7d727ffdb1a

SHA512
e4d8463aedfeaa62ea03499fb63c36ea20009f91b5a47d096a65e85eb10d430b03f8c8384bc0cc18a16133d8294fc66aff7fa6fbc870c43ff312f1299f235934

Download Submit
memory/920-86-0x00000000002B0000-0x00000000002C4000-memory.dmp

Filesize
80KB

Download
memory/920-83-0x0000000000860000-0x0000000000B63000-memory.dmp

Filesize
3.0MB

Download
memory/920-81-0x000000000041EB70-mapping.dmp

Download
memory/920-80-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/920-84-0x0000000000270000-0x0000000000284000-memory.dmp

Filesize
80KB

Download
memory/1192-87-0x0000000006390000-0x0000000006537000-memory.dmp

Filesize
1.7MB

Download
memory/1192-85-0x00000000061F0000-0x0000000006386000-memory.dmp

Filesize
1.6MB

Download
memory/1192-95-0x0000000006950000-0x0000000006A42000-memory.dmp

Filesize
968KB

Download
memory/1608-75-0x000007FEFC0C1000-0x000007FEFC0C3000-memory.dmp

Filesize
8KB

Download
memory/1608-74-0x0000000000000000-mapping.dmp

Download
memory/1640-60-0x0000000072C71000-0x0000000072C74000-memory.dmp

Filesize
12KB

Download
memory/1640-63-0x00000000769B1000-0x00000000769B3000-memory.dmp

Filesize
8KB

Download
memory/1640-62-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1640-61-0x00000000706F1000-0x00000000706F3000-memory.dmp

Filesize
8KB

Download
memory/1708-88-0x0000000000000000-mapping.dmp

Download
memory/1708-92-0x0000000000080000-0x00000000000AE000-memory.dmp

Filesize
184KB

Download
memory/1708-93-0x0000000001E30000-0x0000000002133000-memory.dmp

Filesize
3.0MB

Download
memory/1708-91-0x0000000000150000-0x000000000016C000-memory.dmp

Filesize
112KB

Download
memory/1708-94-0x0000000002140000-0x00000000021D3000-memory.dmp

Filesize
588KB

Download
memory/1948-90-0x0000000000000000-mapping.dmp

Download
memory/1956-79-0x0000000000E30000-0x0000000000E5F000-memory.dmp

Filesize
188KB

Download
memory/1956-78-0x00000000050C0000-0x0000000005125000-memory.dmp

Filesize
404KB

Download
memory/1956-77-0x0000000000390000-0x0000000000397000-memory.dmp

Filesize
28KB

Download
memory/1956-76-0x0000000000630000-0x0000000000631000-memory.dmp

Filesize
4KB

Download
memory/1956-72-0x0000000000EF0000-0x0000000000EF1000-memory.dmp

Filesize
4KB

Download
memory/1956-69-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads